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-rw-r--r--source/libsmb/namequery.c575
1 files changed, 575 insertions, 0 deletions
diff --git a/source/libsmb/namequery.c b/source/libsmb/namequery.c
new file mode 100644
index 00000000000..f988504bba5
--- /dev/null
+++ b/source/libsmb/namequery.c
@@ -0,0 +1,575 @@
+/*
+ Unix SMB/Netbios implementation.
+ Version 1.9.
+ name query routines
+ Copyright (C) Andrew Tridgell 1994-1998
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include "includes.h"
+
+extern pstring scope;
+extern int DEBUGLEVEL;
+
+/* nmbd.c sets this to True. */
+BOOL global_in_nmbd = False;
+
+/****************************************************************************
+interpret a node status response
+****************************************************************************/
+static void _interpret_node_status(char *p, char *master,char *rname)
+{
+ int numnames = CVAL(p,0);
+ DEBUG(1,("received %d names\n",numnames));
+
+ if (rname) *rname = 0;
+ if (master) *master = 0;
+
+ p += 1;
+ while (numnames--)
+ {
+ char qname[17];
+ int type;
+ fstring flags;
+ int i;
+ *flags = 0;
+ StrnCpy(qname,p,15);
+ type = CVAL(p,15);
+ p += 16;
+
+ fstrcat(flags, (p[0] & 0x80) ? "<GROUP> " : " ");
+ if ((p[0] & 0x60) == 0x00) fstrcat(flags,"B ");
+ if ((p[0] & 0x60) == 0x20) fstrcat(flags,"P ");
+ if ((p[0] & 0x60) == 0x40) fstrcat(flags,"M ");
+ if ((p[0] & 0x60) == 0x60) fstrcat(flags,"H ");
+ if (p[0] & 0x10) fstrcat(flags,"<DEREGISTERING> ");
+ if (p[0] & 0x08) fstrcat(flags,"<CONFLICT> ");
+ if (p[0] & 0x04) fstrcat(flags,"<ACTIVE> ");
+ if (p[0] & 0x02) fstrcat(flags,"<PERMANENT> ");
+
+ if (master && !*master && type == 0x1d) {
+ StrnCpy(master,qname,15);
+ trim_string(master,NULL," ");
+ }
+
+ if (rname && !*rname && type == 0x20 && !(p[0]&0x80)) {
+ StrnCpy(rname,qname,15);
+ trim_string(rname,NULL," ");
+ }
+
+ for (i = strlen( qname) ; --i >= 0 ; ) {
+ if (!isprint((int)qname[i])) qname[i] = '.';
+ }
+ DEBUG(1,("\t%-15s <%02x> - %s\n",qname,type,flags));
+ p+=2;
+ }
+ DEBUG(1,("num_good_sends=%d num_good_receives=%d\n",
+ IVAL(p,20),IVAL(p,24)));
+}
+
+
+/****************************************************************************
+ do a netbios name status query on a host
+
+ the "master" parameter is a hack used for finding workgroups.
+ **************************************************************************/
+BOOL name_status(int fd,char *name,int name_type,BOOL recurse,
+ struct in_addr to_ip,char *master,char *rname,
+ void (*fn)(struct packet_struct *))
+{
+ BOOL found=False;
+ int retries = 2;
+ int retry_time = 5000;
+ struct timeval tval;
+ struct packet_struct p;
+ struct packet_struct *p2;
+ struct nmb_packet *nmb = &p.packet.nmb;
+ static int name_trn_id = 0;
+
+ bzero((char *)&p,sizeof(p));
+
+ if (!name_trn_id) name_trn_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) +
+ ((unsigned)getpid()%(unsigned)100);
+ name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
+
+ nmb->header.name_trn_id = name_trn_id;
+ nmb->header.opcode = 0;
+ nmb->header.response = False;
+ nmb->header.nm_flags.bcast = False;
+ nmb->header.nm_flags.recursion_available = False;
+ nmb->header.nm_flags.recursion_desired = False;
+ nmb->header.nm_flags.trunc = False;
+ nmb->header.nm_flags.authoritative = False;
+ nmb->header.rcode = 0;
+ nmb->header.qdcount = 1;
+ nmb->header.ancount = 0;
+ nmb->header.nscount = 0;
+ nmb->header.arcount = 0;
+
+ make_nmb_name(&nmb->question.question_name,name,name_type,scope);
+
+ nmb->question.question_type = 0x21;
+ nmb->question.question_class = 0x1;
+
+ p.ip = to_ip;
+ p.port = NMB_PORT;
+ p.fd = fd;
+ p.timestamp = time(NULL);
+ p.packet_type = NMB_PACKET;
+
+ GetTimeOfDay(&tval);
+
+ if (!send_packet(&p))
+ return(False);
+
+ retries--;
+
+ while (1)
+ {
+ struct timeval tval2;
+ GetTimeOfDay(&tval2);
+ if (TvalDiff(&tval,&tval2) > retry_time) {
+ if (!retries) break;
+ if (!found && !send_packet(&p))
+ return False;
+ GetTimeOfDay(&tval);
+ retries--;
+ }
+
+ if ((p2=receive_packet(fd,NMB_PACKET,90)))
+ {
+ struct nmb_packet *nmb2 = &p2->packet.nmb;
+ debug_nmb_packet(p2);
+
+ if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
+ !nmb2->header.response) {
+ /* its not for us - maybe deal with it later */
+ if (fn)
+ fn(p2);
+ else
+ free_packet(p2);
+ continue;
+ }
+
+ if (nmb2->header.opcode != 0 ||
+ nmb2->header.nm_flags.bcast ||
+ nmb2->header.rcode ||
+ !nmb2->header.ancount ||
+ nmb2->answers->rr_type != 0x21) {
+ /* XXXX what do we do with this? could be a redirect, but
+ we'll discard it for the moment */
+ free_packet(p2);
+ continue;
+ }
+
+ _interpret_node_status(&nmb2->answers->rdata[0], master,rname);
+ free_packet(p2);
+ return(True);
+ }
+ }
+
+
+ DEBUG(0,("No status response (this is not unusual)\n"));
+
+ return(False);
+}
+
+
+/****************************************************************************
+ do a netbios name query to find someones IP
+ returns an array of IP addresses or NULL if none
+ *count will be set to the number of addresses returned
+ ****************************************************************************/
+struct in_addr *name_query(int fd,char *name,int name_type, BOOL bcast,BOOL recurse,
+ struct in_addr to_ip, int *count, void (*fn)(struct packet_struct *))
+{
+ BOOL found=False;
+ int i, retries = 3;
+ int retry_time = bcast?250:2000;
+ struct timeval tval;
+ struct packet_struct p;
+ struct packet_struct *p2;
+ struct nmb_packet *nmb = &p.packet.nmb;
+ static int name_trn_id = 0;
+ struct in_addr *ip_list = NULL;
+
+ bzero((char *)&p,sizeof(p));
+ (*count) = 0;
+
+ if (!name_trn_id) name_trn_id = ((unsigned)time(NULL)%(unsigned)0x7FFF) +
+ ((unsigned)getpid()%(unsigned)100);
+ name_trn_id = (name_trn_id+1) % (unsigned)0x7FFF;
+
+ nmb->header.name_trn_id = name_trn_id;
+ nmb->header.opcode = 0;
+ nmb->header.response = False;
+ nmb->header.nm_flags.bcast = bcast;
+ nmb->header.nm_flags.recursion_available = False;
+ nmb->header.nm_flags.recursion_desired = recurse;
+ nmb->header.nm_flags.trunc = False;
+ nmb->header.nm_flags.authoritative = False;
+ nmb->header.rcode = 0;
+ nmb->header.qdcount = 1;
+ nmb->header.ancount = 0;
+ nmb->header.nscount = 0;
+ nmb->header.arcount = 0;
+
+ make_nmb_name(&nmb->question.question_name,name,name_type,scope);
+
+ nmb->question.question_type = 0x20;
+ nmb->question.question_class = 0x1;
+
+ p.ip = to_ip;
+ p.port = NMB_PORT;
+ p.fd = fd;
+ p.timestamp = time(NULL);
+ p.packet_type = NMB_PACKET;
+
+ GetTimeOfDay(&tval);
+
+ if (!send_packet(&p))
+ return NULL;
+
+ retries--;
+
+ while (1)
+ {
+ struct timeval tval2;
+ GetTimeOfDay(&tval2);
+ if (TvalDiff(&tval,&tval2) > retry_time) {
+ if (!retries) break;
+ if (!found && !send_packet(&p))
+ return NULL;
+ GetTimeOfDay(&tval);
+ retries--;
+ }
+
+ if ((p2=receive_packet(fd,NMB_PACKET,90)))
+ {
+ struct nmb_packet *nmb2 = &p2->packet.nmb;
+ debug_nmb_packet(p2);
+
+ if (nmb->header.name_trn_id != nmb2->header.name_trn_id ||
+ !nmb2->header.response) {
+ /* its not for us - maybe deal with it later
+ (put it on the queue?) */
+ if (fn)
+ fn(p2);
+ else
+ free_packet(p2);
+ continue;
+ }
+
+ if (nmb2->header.opcode != 0 ||
+ nmb2->header.nm_flags.bcast ||
+ nmb2->header.rcode ||
+ !nmb2->header.ancount) {
+ /* XXXX what do we do with this? could be a redirect, but
+ we'll discard it for the moment */
+ free_packet(p2);
+ continue;
+ }
+
+ ip_list = (struct in_addr *)Realloc(ip_list, sizeof(ip_list[0]) *
+ ((*count)+nmb2->answers->rdlength/6));
+ if (ip_list) {
+ DEBUG(fn?3:2,("Got a positive name query response from %s ( ",
+ inet_ntoa(p2->ip)));
+ for (i=0;i<nmb2->answers->rdlength/6;i++) {
+ putip((char *)&ip_list[(*count)],&nmb2->answers->rdata[2+i*6]);
+ DEBUG(fn?3:2,("%s ",inet_ntoa(ip_list[(*count)])));
+ (*count)++;
+ }
+ DEBUG(fn?3:2,(")\n"));
+ }
+ found=True; retries=0;
+ free_packet(p2);
+ if (fn) break;
+ }
+ }
+
+ return ip_list;
+}
+
+/********************************************************
+ Start parsing the lmhosts file.
+*********************************************************/
+
+FILE *startlmhosts(char *fname)
+{
+ FILE *fp = fopen(fname,"r");
+ if (!fp) {
+ DEBUG(4,("startlmhosts: Can't open lmhosts file %s. Error was %s\n",
+ fname, strerror(errno)));
+ return NULL;
+ }
+ return fp;
+}
+
+/********************************************************
+ Parse the next line in the lmhosts file.
+*********************************************************/
+
+BOOL getlmhostsent( FILE *fp, char *name, int *name_type, struct in_addr *ipaddr)
+{
+ pstring line;
+
+ while(!feof(fp) && !ferror(fp)) {
+ pstring ip,flags,extra;
+ char *ptr;
+ int count = 0;
+
+ *name_type = -1;
+
+ if (!fgets_slash(line,sizeof(pstring),fp))
+ continue;
+
+ if (*line == '#')
+ continue;
+
+ pstrcpy(ip,"");
+ pstrcpy(name,"");
+ pstrcpy(flags,"");
+
+ ptr = line;
+
+ if (next_token(&ptr,ip ,NULL,sizeof(ip)))
+ ++count;
+ if (next_token(&ptr,name ,NULL, sizeof(name)))
+ ++count;
+ if (next_token(&ptr,flags,NULL, sizeof(flags)))
+ ++count;
+ if (next_token(&ptr,extra,NULL, sizeof(extra)))
+ ++count;
+
+ if (count <= 0)
+ continue;
+
+ if (count > 0 && count < 2)
+ {
+ DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",line));
+ continue;
+ }
+
+ if (count >= 4)
+ {
+ DEBUG(0,("getlmhostsent: too many columns in lmhosts file (obsolete syntax)\n"));
+ continue;
+ }
+
+ DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n", ip, name, flags));
+
+ if (strchr(flags,'G') || strchr(flags,'S'))
+ {
+ DEBUG(0,("getlmhostsent: group flag in lmhosts ignored (obsolete)\n"));
+ continue;
+ }
+
+ *ipaddr = *interpret_addr2(ip);
+
+ /* Extra feature. If the name ends in '#XX', where XX is a hex number,
+ then only add that name type. */
+ if((ptr = strchr(name, '#')) != NULL)
+ {
+ char *endptr;
+
+ ptr++;
+ *name_type = (int)strtol(ptr, &endptr,0);
+
+ if(!*ptr || (endptr == ptr))
+ {
+ DEBUG(0,("getlmhostsent: invalid name %s containing '#'.\n", name));
+ continue;
+ }
+
+ *(--ptr) = '\0'; /* Truncate at the '#' */
+ }
+
+ return True;
+ }
+
+ return False;
+}
+
+/********************************************************
+ Finish parsing the lmhosts file.
+*********************************************************/
+
+void endlmhosts(FILE *fp)
+{
+ fclose(fp);
+}
+
+/********************************************************
+ Resolve a name into an IP address. Use this function if
+ the string is either an IP address, DNS or host name
+ or NetBIOS name. This uses the name switch in the
+ smb.conf to determine the order of name resolution.
+*********************************************************/
+
+BOOL resolve_name(char *name, struct in_addr *return_ip)
+{
+ int i;
+ BOOL pure_address = True;
+ pstring name_resolve_list;
+ fstring tok;
+ char *ptr;
+
+ if (strcmp(name,"0.0.0.0") == 0) {
+ return_ip->s_addr = 0;
+ return True;
+ }
+ if (strcmp(name,"255.255.255.255") == 0) {
+ return_ip->s_addr = 0xFFFFFFFF;
+ return True;
+ }
+
+ for (i=0; pure_address && name[i]; i++)
+ if (!(isdigit((int)name[i]) || name[i] == '.'))
+ pure_address = False;
+
+ /* if it's in the form of an IP address then get the lib to interpret it */
+ if (pure_address) {
+ return_ip->s_addr = inet_addr(name);
+ return True;
+ }
+
+ pstrcpy(name_resolve_list, lp_name_resolve_order());
+ ptr = name_resolve_list;
+ if (!ptr || !*ptr) ptr = "host";
+
+ while (next_token(&ptr, tok, LIST_SEP, sizeof(tok))) {
+ if(strequal(tok, "host") || strequal(tok, "hosts")) {
+
+ /*
+ * "host" means do a localhost, or dns lookup.
+ */
+
+ struct hostent *hp;
+
+ DEBUG(3,("resolve_name: Attempting host lookup for name %s\n", name));
+
+ if (((hp = Get_Hostbyname(name)) != NULL) && (hp->h_addr != NULL)) {
+ putip((char *)return_ip,(char *)hp->h_addr);
+ return True;
+ }
+
+ } else if(strequal( tok, "lmhosts")) {
+
+ /*
+ * "lmhosts" means parse the local lmhosts file.
+ */
+
+ FILE *fp;
+ pstring lmhost_name;
+ int name_type;
+
+ DEBUG(3,("resolve_name: Attempting lmhosts lookup for name %s\n", name));
+
+ fp = startlmhosts( LMHOSTSFILE );
+ if(fp) {
+ while( getlmhostsent(fp, lmhost_name, &name_type, return_ip ) ) {
+ if( strequal(name, lmhost_name )) {
+ endlmhosts(fp);
+ return True;
+ }
+ }
+ endlmhosts(fp);
+ }
+
+ } else if(strequal( tok, "wins")) {
+
+ int sock;
+
+ /*
+ * "wins" means do a unicast lookup to the WINS server.
+ * Ignore if there is no WINS server specified or if the
+ * WINS server is one of our interfaces (if we're being
+ * called from within nmbd - we can't do this call as we
+ * would then block).
+ */
+
+ DEBUG(3,("resolve_name: Attempting wins lookup for name %s<0x20>\n", name));
+
+ if(*lp_wins_server()) {
+ struct in_addr wins_ip = *interpret_addr2(lp_wins_server());
+ BOOL wins_ismyip = ismyip(wins_ip);
+
+ if((wins_ismyip && !global_in_nmbd) || !wins_ismyip) {
+ sock = open_socket_in( SOCK_DGRAM, 0, 3,
+ interpret_addr(lp_socket_address()) );
+
+ if (sock != -1) {
+ struct in_addr *iplist = NULL;
+ int count;
+ iplist = name_query(sock, name, 0x20, False, True, wins_ip, &count, NULL);
+ if(iplist != NULL) {
+ *return_ip = iplist[0];
+ free((char *)iplist);
+ close(sock);
+ return True;
+ }
+ close(sock);
+ }
+ }
+ } else {
+ DEBUG(3,("resolve_name: WINS server resolution selected and no WINS server present.\n"));
+ }
+ } else if(strequal( tok, "bcast")) {
+
+ int sock;
+
+ /*
+ * "bcast" means do a broadcast lookup on all the local interfaces.
+ */
+
+ DEBUG(3,("resolve_name: Attempting broadcast lookup for name %s<0x20>\n", name));
+
+ sock = open_socket_in( SOCK_DGRAM, 0, 3,
+ interpret_addr(lp_socket_address()) );
+
+ if (sock != -1) {
+ struct in_addr *iplist = NULL;
+ int count;
+ int num_interfaces = iface_count();
+ set_socket_options(sock,"SO_BROADCAST");
+ /*
+ * Lookup the name on all the interfaces, return on
+ * the first successful match.
+ */
+ for( i = 0; i < num_interfaces; i++) {
+ struct in_addr sendto_ip;
+ /* Done this way to fix compiler error on IRIX 5.x */
+ sendto_ip = *iface_bcast(*iface_n_ip(i));
+ iplist = name_query(sock, name, 0x20, True, False, sendto_ip, &count, NULL);
+ if(iplist != NULL) {
+ *return_ip = iplist[0];
+ free((char *)iplist);
+ close(sock);
+ return True;
+ }
+ }
+ close(sock);
+ }
+
+ } else {
+ DEBUG(0,("resolve_name: unknown name switch type %s\n", tok));
+ }
+ }
+
+ return False;
+}
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